Cutting-stick for paper-cutting machines.



B. M. HELM.

CUTTING STIGK FOR. PAPER CUTTING MAGHINES.

BIPITIOATIDN FILED SEPT. 26,1909.

Patented Sept.6,1910.

UNITED STATES PATENT OFFICE.

BRUCE MONROE HELM, OF HAGERSTOWN, MARYLAND.

CUTTING-STICK FOR PAPER-CUTTING MACHINES.

To all whom it may concern:

Be it known that I, BRUCE M. HELM, a citizen of the United States,residing at Hagerstown, in the county of WVashington and State ofMaryland, have invented certain new and useful Improvements inCutting-Sticks for Paper-Cutting Machines, of which the following is aspecification.

This invention relates to cutting sticks for paper cutting machines, andpertains especially to means for securing a wooden block or strip in ametal holder or bar of special construction.

In this class of devices it is highly essential that the wooden strip orblock, against which the cutting edge of a knife or blade strikes, besecurely held in a metal bar, so that it may be placed and removed, andafter becoming worn by the knife edge it may be readily removed and anew cuttingstrip substituted. It is the purpose of this inventiontoprovide novel and peculiar means for such placing and removal of thestrip in a most expeditious manner. Such strips are usually held in barsor blocks by screw bolts and clamping plates, and I have a companionapplication of even date herewith for an improved device for clamping awooden strip in a metallic bar or holder by special construction of theholder and by special clamping-plates controlled by setscrews. Y

The object of the invention is to provide means for effecting theclamping of the strip in the bar or holder by certain means other thanclamping-plates, set-bolts and setscrews.

To this end the invention consists in the novel construction andarrangement of parts, and resides essentially in holding the strip inthe bar by cams operated from and through the top of the bar against thestrip.

In the accompanying drawings forming part of this application: Figure 1is a sectional view of a guillotine paper cutter partly broken awayshowing the application of the invention. Fig. 2 is a perspective viewof the cutting stick showing the strip secured therein. Fig. 3 is asimilar view showing the holder without the strip and with the cam inposition to permit the insertion of the strip. Fig. 4 is an enlargedcross section on the line mw, Fig. 2. Fig. 5 is a similar view with thestrip and cam removed. Fig. 6 is a perspective view ofone of the cams.

Specification of Letters Patent.

Application filed September 25, 1909.

Patented Sept. 6, 1910.

Serial No. 519,585.

The same reference numerals denote the same parts throughout the severalviews of the drawings.

The cutting stick is shown secured in the bed 1, of a guillotine papercutting machine, provided with a cutter or knife 2.

The cutting stick consists of a metal bar 3 having side flanges 4 and 5forming a longitudinal groove 6, for a wooden strip 7. The flange 4 hascircular recesses 8, one side of which opens through the inner side ofthe flange a into the groove 6. Circular seats 9 are made in the bar 3,from the base of the groove 6 whence such seat extends for a portion ofthe depth of the bar 3, and from the bottom of the seats 9, a hole 10extends to the bottom of the bar.

The means for securing the strip 7 in the groove 6, consists of pins orplugs 11 fitting the seats 9, and having a pintle 12 loosely fitting theholes 10, the ends of the pintle being enlarged or spread to preventdisplacement. A head 13 having a screw-driver slot for turning it, isprojected from the plug or pin 11 eccentric to the plug or pin so as toform a cam which is operated in the recesses S, and against the strip.

It will be observed that the cams when turned into the groove 6 wedge orforce the strip against the flange 5, so as to leave a space between theflange 4t and the strip 7 to permit expansion of the strip.

It will be seen that the strip may be inserted and removed Withoutdetaching the bar or removing it from the bed of the cutting machine, bysimply operating the pins 11.

Having thus described my invention what I claim as new and desire tosecure by Letters Patent is:

1. A cut-ting stick for paper cutting machines, comprising a bar havinga pair of flanges forming a groove, a strip loosely fitting the groove,and eccentric pins working through one of the flanges for wedging thestrip against the other flange.

2. A cutting stick for paper cutting machines, comprising a grooved barhaving side flanges, a strip loosely fitting the groove, and cams seatedin one of the flanges and working through the inner face thereof forwedging the strip against the other flange.

3. A cutting stick for paper cutting machines, comprising a grooved barhaving side flanges, a strip loosely fitting the groove, pins turnablein the bar under one of the flanges and having a cam Working through theinner face of this flange into the groove for Wedging the strip againstthe other flange.

4. In a cutting stick for paper cutting machines, the combination, Witha grooved bar having side flanges, and a strip loosely fitting thegroove, of means for securing the strip in the groove comprising pinsanchored in the bar under one of the flanges and having an eccentrichead turnable through the inner face of said flange to make a camengagement with the strip.

5. In a cutting stick for paper cutting machines, the combination, Witha grooved bar having circular seats under one of the Walls of thegroove, circular recesses extendingfrom the seats and opening throughthe inner face of this Wall, and a cutting'strip loosely fitting thegroove, of pins turnable in the seats and having a pintle extendingthrough the bottom of the bar for anchoring the pins, and an eccentrichead turnable in the recesses and against the strip to clamp it in thegroove.

In Witness whereof I hereunto set my hand in the presence of twoWitnesses.

BRUCE MONROE HELM.

Vitnesses EDNA A. MACKENZIE, MARY BLACK.

